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Improve the detection of the path

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Summary:
When clang is used under GNU/Linux in a chroot without /proc mount, it falls
back on the BSD method. However, since the buf variable is used twice
and fails with snprintf to produce the correct path.

When called as relatived (ie ./clang), it was failing with:
 "" -cc1 [...] -x c++ x.cc
error: unable to execute command: Executable "" doesn't exist!


I also took the opportunity to simply the code (the first arg of test_dir
was useless).

Reviewers: rafael

Reviewed By: rafael

CC: cfe-commits

Differential Revision: http://llvm-reviews.chandlerc.com/D2361

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@196791 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Sylvestre Ledru 2013-12-09 16:27:00 +00:00
parent 68138dc9a8
commit 1a803295d0
1 changed files with 12 additions and 11 deletions
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23
lib/Support/Unix/Path.inc
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@ -184,15 +184,15 @@ namespace fs {
defined(__OpenBSD__) || defined(__minix) || defined(__FreeBSD_kernel__) || \
defined(__linux__) || defined(__CYGWIN__) || defined(__DragonFly__)
static int
test_dir(char buf[PATH_MAX], char ret[PATH_MAX],
const char *dir, const char *bin)
{
test_dir(char ret[PATH_MAX], const char *dir, const char *bin)
{
struct stat sb;
char fullpath[PATH_MAX];
snprintf(buf, PATH_MAX, "%s/%s", dir, bin);
if (realpath(buf, ret) == NULL)
snprintf(fullpath, PATH_MAX, "%s/%s", dir, bin);
if (realpath(fullpath, ret) == NULL)
return (1);
if (stat(buf, &sb) != 0)
if (stat(fullpath, &sb) != 0)
return (1);
return (0);
@ -201,20 +201,21 @@ test_dir(char buf[PATH_MAX], char ret[PATH_MAX],
static char *
getprogpath(char ret[PATH_MAX], const char *bin)
{
char *pv, *s, *t, buf[PATH_MAX];
char *pv, *s, *t;
/* First approach: absolute path. */
if (bin[0] == '/') {
if (test_dir(buf, ret, "/", bin) == 0)
if (test_dir(ret, "/", bin) == 0)
return (ret);
return (NULL);
}
/* Second approach: relative path. */
if (strchr(bin, '/') != NULL) {
if (getcwd(buf, PATH_MAX) == NULL)
char cwd[PATH_MAX];
if (getcwd(cwd, PATH_MAX) == NULL)
return (NULL);
if (test_dir(buf, ret, buf, bin) == 0)
if (test_dir(ret, cwd, bin) == 0)
return (ret);
return (NULL);
}
@ -226,7 +227,7 @@ getprogpath(char ret[PATH_MAX], const char *bin)
if (pv == NULL)
return (NULL);
while ((t = strsep(&s, ":")) != NULL) {
if (test_dir(buf, ret, t, bin) == 0) {
if (test_dir(ret, t, bin) == 0) {
free(pv);
return (ret);
}